The Bernoulli's equation relates the pressure, velocity, and height of a fluid in a streamline. Which of the following assumptions is NOT made in the derivation of Bernoulli's equation?
- Steady flow
- Incompressible fluid
- No external forces acting on the fluid
- Negligible viscosity
Explanation
Bernoulli's equation is derived under the following assumptions:
- A) Steady flow (Flow parameters do not change with time)
- B) Incompressible fluid (Density remains constant)
- C) No external forces acting on the fluid. Incorrect assumption
→ Bernoulli’s equation does consider external forces like gravity (included as potential energy).
- D) Negligible viscosity (No energy loss due to internal friction)
Thus, option C is not assumed and is the correct answer.
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